1 files changed, 22 insertions, 0 deletions
diff --git a/sphinx/ext/autodoc/mock.py b/sphinx/ext/autodoc/mock.py
index 40258a135..3b4991856 100644
--- a/sphinx/ext/autodoc/mock.py
+++ b/sphinx/ext/autodoc/mock.py
@@ -17,6 +17,7 @@ from types import FunctionType, MethodType, ModuleType
 from typing import Any, Generator, Iterator, List, Sequence, Tuple, Union
 
 from sphinx.util import logging
+from sphinx.util.inspect import safe_getattr
 
 logger = logging.getLogger(__name__)
 
@@ -147,3 +148,24 @@ def mock(modnames: List[str]) -> Generator[None, None, None]:
     finally:
         sys.meta_path.remove(finder)
         finder.invalidate_caches()
+
+
+def ismock(subject: Any) -> bool:
+    """Check if the object is mocked."""
+    # check the object has '__sphinx_mock__' attribute
+    if not hasattr(subject, '__sphinx_mock__'):
+        return False
+
+    # check the object is mocked module
+    if isinstance(subject, _MockModule):
+        return True
+
+    try:
+        # check the object is mocked object
+        __mro__ = safe_getattr(type(subject), '__mro__', [])
+        if len(__mro__) > 2 and __mro__[1] is _MockObject:
+            return True
+    except AttributeError:
+        pass
+
+    return False